Mapping radionuclide distribution in surface sediments using GIS and an underwater HPGe detector Page: 4 of 7
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Mapping Radionuclide Distribution in Surface Sediments
Using GIS and an Underwater HPGe Detector
D.L. Dunn, W.G. Winn, P.J. Bresnahan
Savannah River Technology Center
Westinghouse Savannah River Company
A radiological distribution survey at the L Lake on the Savannah River Site (SRS) was
conducted by the Savannah River Technology Center (SRTC) during the summer of 1995 as
part of a larger project to examine future alternatives for L Lake and other SRS water bodies',.
The primary purpose of the survey was to confirm previous radionuclide surveys of Cesium-
137 ('3Cs) in the L Lake area. EG&G Energy Measurements, Inc. conducted an aerial, baseline
radiological survey of the L Lake area and the Steel Creek drainage basin in 1985. Overflight
gamma mappings of the area by EG&G indicated that the only significant man-made
radionuclides were located in the stream beds3, which were subsequently covered by the
reservoir. The major concern was to see if any of the man-made radiation was redistributed
over time away from the stream beds.
In the current study an underwater HPGe detector was used to scope the possibility of
sediment redistribution from the stream beds beneath L Lake. The underwater detector was
positioned to view the bottom sediment and the geographic position of the pontoon boat used
for deployment was recorded. The count rate at each position is proportional to the radiation
level that would be observed if the lake water were absent, as in the 1985 overflight
measurements. Thus, the 1995 study yields count rate profiles that are appropriate for
comparison with the gamma mappings of 1985.
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Dunn, D.L.; Winn, W.G. & Bresnahan, P.J. Mapping radionuclide distribution in surface sediments using GIS and an underwater HPGe detector, article, September 1, 1996; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc676031/m1/4/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.